Titanium dioxide is an important white pigment, which can be divided into plate titanium type, anatase type and rutile type, plate titanium type is very unstable. Compared with traditional white pigments such as lead white, zinc white, zinc barium white, titanium dioxide has a variety of excellent properties such as high refractive index, strong achromatic power, large hiding power, and harmlessness, and is known as a good white pigment. Used in coatings, plastics, chemical fibers, ceramics and other industries. Among them, the amount of paint is very large, accounting for about 57% of the total amount of titanium dioxide. So how is titanium dioxide applied to coatings?   Jinan Weicheng Chemical Co., Ltd. is a professional titanium dioxide distributor, we have a professional team, to provide good service for consumers, if you need titanium dioxide, please choose Shanghai Haoluo.   First, the role of titanium dioxide in coatings   The coating is mainly composed of four parts, such as film-forming substances, pigments, solvents and additives, and the pigments in the paint have a certain hiding power, which can not only cover the original color of the painted object, but also give the coating film a bright color, and realize the decorative effect of lighting and beautification. At the same time, the pigment is closely combined with the curing agent and the substrate, and is integrated, which can enhance the mechanical strength and adhesion of the coating film, prevent cracking or falling off, and can enhance the thickness of the coating film, prevent the penetration of ultraviolet rays or moisture, improve the anti-aging and durability of the coating film, and extend the service life of the coating film and the protected object.   Among the pigments, the amount of white pigment is very large, and the performance requirements of the coating for white pigment: (1) good whiteness; (2) Good grinding and wettability; (3) Good weather resistance; (4) Good chemical stability; (5) Small particle size, high hiding power and achromatic power, good opacity and gloss.   Titanium dioxide is a white pigment used in coatings, its output accounts for more than 70% of inorganic pigments, and the consumption accounts for 95.5% of the total consumption of white pigments. At present, about 60% of the world's titanium dioxide is used to manufacture various coatings, especially rutile titanium dioxide, most of which is consumed by the coating industry. Coatings made of titanium dioxide, bright color, high hiding power, strong coloring power, saving dosage, many varieties, protect the stability of the medium, and can enhance the mechanical strength and adhesion of the paint film, prevent cracks, prevent ultraviolet rays and moisture penetration, prolong the life of the paint film, and the color matching of almost every pattern in the colorful pattern paint is inseparable from titanium dioxide.   Different kinds of coatings for different uses have different requirements for titanium dioxide, such as powder coatings require rutile titanium dioxide with good dispersion. Anatase titanium dioxide has low achromatic power, strong photochemical activity, used in powder coatings, and the coating film is prone to yellowing. The rutile titanium dioxide produced by the sulfuric acid method has the advantages of moderate price, good dispersion, good hiding power and achromatic power, etc., and is very suitable for indoor powder coating. In addition to good dispersion, hiding power and color elimination power, titanium dioxide for outdoor powder coating also requires good weathering, so the rutile titanium dioxide produced by the general chlorination method of titanium powder for outdoor powder coating.   Second, the impact of the main quality fluctuation of titanium dioxide on the coating   1 whiteness   Titanium dioxide as a white pigment of the coating, its whiteness is very important, is one of the key quality indicators of the coating requirements, titanium dioxide whiteness is poor, will directly affect the appearance of the coating film. The main factor affecting the whiteness of titanium dioxide is the type of harmful impurities, because titanium dioxide is very sensitive to impurities, especially rutile titanium dioxide.   Therefore, even trace impurities will have a significant impact on the whiteness of titanium dioxide. The whiteness of titanium dioxide produced by the chlorination process is often better than that produced by the sulfuric acid process, because the raw material titanium tetrachloride used in the chlorination process to produce titanium dioxide has been distilled and purified, and the impurity content of the raw materials used in the sulfuric acid process is high, and the impurities can only be removed by washing and bleaching and other process technologies.   2 Hiding power   The hiding force is the surface area of the coated object per square centimeter, when it is completely covered, the sam

Papermaking is the third largest user of titanium dioxide. Titanium dioxide is generally not used in low-grade paper due to the consideration of production costs, mainly using porcelain clay, talcum powder, calcium carbonate, etc., but they will reduce the strength of the paper and increase the weight of the paper. Decorative paper, Bible paper and banknotes (such as: dictionaries, pictorials, magazine covers, computers, banknotes, copiers and decorative paper, etc.) must use titanium dioxide, the use of titanium dioxide paper, good whiteness, high strength, glossy, thin and smooth, printing does not penetrate, under the same conditions opacity than calcium carbonate, talc 10 times higher, weight can also be reduced by 15% ~ 30%.           Decorative paper, also known as titanium paper, is mainly used as raw materials for making furniture, flooring, wallpaper, etc. For paper with anti-aging requirements, rutile must be used; More rutile is used in high-ash paper, which must use rutile because the hiding power of anatase titanium dioxide does not meet the requirements. Anatase titanium dioxide are used in low ash paper, such as Bible paper and banknotes, etc., Bible paper requires good opacity of paper, generally using anatase titanium dioxide can be met; Mint paper also requires good opacity, mainly using anatase type. In China, the amount of titanium dioxide used in decorative paper is much higher than that of the other two varieties, and this situation is determined by China's consumption level. Due to the large demand for house decoration and high-end furniture, the amount of decorative paper has gradually increased; Due to the use of titanium white as raw material, the cost of Bible paper is much higher than that of ordinary paper, in view of the domestic consumption level, the market for Bible paper is very limited; The manufacture and use of mint paper is controlled by the state, and the dosage is relatively stable and will not affect the titanium dioxide market. According to incomplete estimates, the domestic titanium dioxide used for decorative paper exceeds 30,000 tons per year. The amount of titanium dioxide in decorative paper is 20~40%, and the amount of titanium dioxide in other paper is 1~5%. As traditional cultural paper production plants have transformed into the production of decorative paper, the output of decorative paper has increased rapidly, and the price of decorative paper has shown a downward trend in recent years. Regardless of the type of paper (base paper), the production process is the same:           Rutile is used for weather-resistant, high-ash paper, anatase type is used for paper, low ash content paper with low weather requirements, and the main reason for determining which titanium dioxide is used by paper mills is the cost of papermaking, that is, the cost performance of titanium dioxide. Since the cost ratio of titanium dioxide in papermaking is as high as 30~50%, so the paper mill can be said to be careful about the choice of titanium dioxide in the case of meeting user requirements, and can use anatase type never use rutile. The quality requirements of the paper industry for titanium dioxide, in order of importance, are:           1) Hiding power (opacity): the ability of paper containing the same titanium dioxide to cover the base color, this indicator determines the cost performance of titanium white. Simply put, titanium dioxide with high hiding power is generally high in price, but the amount of use is small, so the cost of titanium dioxide per ton of paper may be lower; Titanium dioxide with low hiding power, although the price is low, but the amount is large, resulting in an increase in the cost of titanium dioxide per ton of paper;            2) Whiteness: The whiteness of titanium white determines the appearance of the paper after molding; The difference between rutile titanium dioxide and anatase titanium dioxide           1. Physicality           1) Relative density           Among the commonly used white pigments, titanium dioxide has the smallest relative density, and among white pigments of the same quality, titanium dioxide has the largest surface area and the highest pigment volume.           2) Melting point and boiling point           Since the anatase type transforms to rutile at high temperatures, the melting and boiling points of anatase titanium dioxide are practically non-existent. Only rutile titanium dioxide has melting point and boiling point, rutile titanium dioxide melting point is 1850 °C, melting point in air is (1830±15) °C, melting point in oxygen is 1879 °C, melting point is related to the purity of titanium dioxide. The boiling point of rutile titanium dioxide is (3200±300) °C, and titanium dioxide is slightly volatile at this high temperature.           3) Dielectric constant          Due to the high dielectric constant of titanium dioxide, it has excellent electrical properties. When determining certain physical propertie

There are two production processes for the manufacture of titanium dioxide: sulfuric acid method and chlorination method. Rutile titanium dioxide and anatase titanium dioxide can be produced by either process.        The sulfuric acid method is to dissolve titanium-containing mineral sands in sulfuric acid to produce a solution of titanium and sulfates of titanium and other metals. It then goes through a series of steps, including chemical reduction, purification, precipitation, washing, and combustion. Then the titanium dioxide intermediate is obtained. Most of the domestic titanium dioxide plants use this process to produce, which is easy to pollute the environment, and the chlorination method includes two high-temperature anhydrous vapor phase reactions. Titanium ore and chlorine react under reducing conditions to generate titanium tetrachloride and metal chloride impurities, after the impurities are removed. High-purity titanium tetrachloride is oxidized at high temperatures to form a very bright titanium dioxide intermediate. This process produces high-quality products and is environmentally friendly, but the cost is relatively high.        Intermediates are clusters of pigment particles of titanium dioxide crystals, which must be dispersed (grinded) and modified by various wet processing methods. Hydrated oxides including silicon, aluminum or zinc are coated on the surface of the pigment particles. Individual oxide hydrate treatments or combinations of different treatments can also be used to obtain the best performance for specific applications.       An important problem in the manufacture of titanium dioxide is the supply of titanium ore, although the reserves of titanium are listed in the top ten elements, but it is widely distributed in nature at low concentrations, and it is necessary to improve the efficiency of mining and mineral processing operations to meet the economic requirements of manufacturing titanium dioxide.        People's awareness of green environmental protection and the continuous improvement of natural resource protection have made the titanium dioxide industry increasingly under increasing pressure on pollution control and titanium ore procurement in production processes. Manufacturing costs have climbed significantly higher than before.        However, under the condition that the domestic economic situation is not optimistic, the downstream main markets of titanium dioxide (real estate, large-scale industrial projects, etc.) have shrunk, resulting in a continuous decline in demand for titanium dioxide, and leading to a unilateral decline in prices; The recovery of international demand has benefited from the export of titanium dioxide, which has increased to a certain extent, but it is still difficult to change the reality of oversupply. So, a price war was waged in the domestic market. The sales of the titanium dioxide industry are facing great competitive pressure.        Under the influence of manufacturing costs and market competition factors, titanium dioxide manufacturers must find ways to reduce the ex-factory cost of products in order to survive. However, in principle, workers' wages and benefits are slowly increased rather than slowly reduced, and the reduction of natural production costs mainly depends on technological innovation.        Due to the adjustment of technology and process, the titanium dioxide coating treatment process, the amount of coating raw materials and additives have changed. Unconsciously, the penetration of substances that have a catalytic effect on the coating film-forming reaction makes the titanium dioxide that originally had little effect on the gloss of the physical matting agent powder coating now has a greater impact.        Different manufacturers and models of titanium dioxide have a very different effect on the gloss of physical matting agent powder coating. For our powder engineers, choose the manufacturer and model of titanium dioxide until the batch. This has become one of the considerations in the formulation of physical matting agent powder coatings. In addition, even some illegal manufacturers or traders fraudulently infiltrate part of the filler into the titanium dioxide, or infiltrate part of the anatase titanium dioxide into the rutile titanium dioxide and then sell it, deceiving consumers. The main indicators of its control are: the mass number of TiO2 parts, the mass part of the volatile at 105 °C, the mass part of the water-soluble matter, the mass part of the sieve residue (45μm), the color, scattering force, oil absorption, the resistivity of the extract, etc. The application characteristics of various industries are different, the requirements for titanium dioxide are not exactly the same, and the inspection methods will be different.